G Webmaster Tool showing zero indexed

I have 5 sites in my Google Webmaster Tool that I track with sitemap. In the last 3 to 5 days my sites are showing zero pages indexed one at a time, now 4 of 5 sites show zero indexed.

Pages are still showing up in search though. Is this something google doing or am I about to get into the google dance?

same here , google is making some changes........

Same here also - looks like a pattern. Mine is something like 5700 pages in sitemap, 0 indexed, and i know they are because they are right there in search results.

Same here in the mg but then it came back to normal. I guess they are changing smth...yet again...